public  abstract class Sporter extends Person{
   // 抽象方法，子类必须实现
    public Sporter() {
    }
    public Sporter(String name, int age) {
        super(name, age);
    }
    
    public abstract void train();

    public void introduce(){
        System.out.println("大家好，我是" + getName() + "，我今年" + getAge() + "岁了");
    }

}
